The phrase yours truly is a traditional sign-off from letters, long used as a polite way for a writer to refer to themselves, and made by yours truly reworks it as a spoken credit. Online, the clip is used less as a literal signature and more as a comedic tag, dropped at the end of edits and reveals where the creator wants the last word. Its popularity comes from that contrast between old-fashioned wording and modern, self-aware bragging in short videos and memes.